Hole-cutting machine



Jan. .1, 1929. 1,697,434

- s. L.. MooRE, JR

HOLE CUTTING MACHINE I Original Filed May 19, 1926 5 Shees-Sheet 1 Jan. l, 1929. 1,697,434

S. L. MOORE. JR

HOLE CUTTING MACHINE riginal Filed May 19, 192e 5 sheets-sheet 2 Jan. l, 1929. 1,697,434

s. L. MooRE. JR

HOLE CUTTING MACHINE originafF-lled May 19, 192e 5 sheets-sheet 3 Jan. 1, 1929. 1,697,434

s. L. MOORE. JR

HOLE CUTTING MACHINE Original Filed May 19, 1926 5 Sheets-Sheet 4 Jan. l, 1929. 1,697,434

s. L. MOORE, JR vHOLE CUTTING MACHINE original Filed May 19, 192s 5 sheets-sheet 5 Patented Jan. l, 1929.

UNITED STA-'res PATENT STEWART L..MOORE,.J'R.OF BALTIMORE, MARYLAND,.ASSIGN.OR TO'LOCKE INSULATOR CORPORATIOLL, OF. BlLIilIll/IORE,vv MARYLAND, A CORPORATION `OF.MARYIIIALI'ID.

HOLE-CUTTING MACHINE.

Application-med May19, 1926; SerialNo. 110,302. Renewedi'F-ebruary,1928.

The invention. relates. to: machines' foncutting holesin. the formation of, insulatorsv of the Hewlett type.l

The. primary,r object of. thev invention, generally stated', isf to provide: a machine by means of: which interlinking curved passages may be cut in` insulators While they arev still in a green or. plastic' condition, the. cutting being done. accurately.l` and uniformly;

Any importantobj ect ot the invention is. to provide a device for this purpose: soi con.- structed and arranged that the ends; of the passages Will' be' flaredv for'the accommodation and to permit slightl playf oi the sus.- pension links: which -arevemployed for' con'- necting a seriesof insulatorstoct'orma string.

It iswell knoW-ntliat insulatorsofthe Hewflett type are-formed with interlinkinggcuived passages,l one opening out atthe topanjd the other at the bottomf The suspension; links are generally of substantially Ulsliape and are slidinto v theJ passages; It' is; a= matter of importance that theLpassages-fbe truef in form and that they have smooth W'alls'inorderfto avoid high spotsI which, when the-links are in place, Would localize or concentrate the strain instead' orl permit-ting it'l to be distribut'ed; To facilitatestheinsertion.offthe1 links inthe passages the passagesfsliouldrhave flaring entrances Whichserve.tlie1additional" purL pose offpermitt'ing"l a certa-in amount of'play of the links-"With respect t'of the' insulators so that the parts mayr accommodatel themselves to the-line ofstraina It' has-been proposed to cut the passages byhand but obviouslyy this .is bound to be a slow. and laborious operation. Furthermore, regardless' of the.v exactA method of cutting there isl a.Y tendency! tor.

the' elay to-tear away at thefend'sofiitlie pas-l sages, resulting in erplaliti'esfand'. minus spots which are naturally. objectionable;

It is with the: above. factsin vieW thatzI have designed the present. invention which has for a more specific objectV the provision ofa machine by means'ofwh'i'ch: interlinliingg curved passages'may be cut" not only quickly, easily and accurately butwhich Will form'the desirable iiaring openings and leav-e the Walls smooth and clean.

Another object of the invention is the pro'-y vision- 0famachine for this purpose provided with or embodying peculiarly constructed cutting members formed ofrelativelyl mov:- able sections so asto be capable oli"l cutting a passage of more than merezsemicireuiar shape;V

Still another.l obj ectIv off the;- in'venton sto.

provide a novel operating means; includingv i a system offl links `and levers for moving; the cutters and:v the' relativelyy movable sections thereof, the diiierent steps ini the movement being properly' timed? tofeiect thezproper. cut- 5 ting action so' that passages'v of. the desired shape willi be formed, adjustments beengg moreover, provided for: regulating tleetlirow of' the movable parts. l'

Yet another object'oftheinventionjis'tlie provisiony of a machine of# this charact'erifin Whichthe eutterslwillmevetoward eaelirotler during the cutting action, .tlie-eutters coming t'orest 1nl end to'. end relatinn, thec machine further embodying an'- important feature,

namely, meansrfor puncturing-theslighti division Wall lef-t between theendso-f thecut'te'rs at the completion of their stroke, theI puncs turlng preventing-'asuct'ion' effect upon; with'- drawal ofthe-cutters so thatdistortionoitli passages Willbe avoided.

An'. additional'L object' of. the invention. i's to i provide ai cutting machine off this= type" pro.L vided `witl'r mea-ns` Whereby'the` entire" cutting mechanism mayf be lifted bodily awayl from the insulatorito a suficien't" height that in'.-

sulators may' beL placedf in. posit-ion',l eut,` inverted and turned for' ad'dit-ion'all eutting Without any interference whatsoever Wit-li any of the moving parts. l

To the attainment of" the. foregoing" and other objects andi advantages su'cliifajs' com-`- parative simplicity, ease. in. operation; and eiiiciency in action,l tlie.- invention.. preferably consistsin. the.construction;combination and arrangement. oft partel to' bel hereinafter` more fully describedd and; claimed", and" illustrated in the accompanyingdrawingsjin' Wliioliz Figure l is` a: front' elevation of'the: coin'- pl'ete machine'. l with. the cutting 5 mechanism shown in its*u highest position,

Figure 2 is a` side elevation. With the out# ting mechanism' shown' in lowered` position at' the beginning'ofa cut,v

-' Figure 3" is a` verticalv section taken in a being shown by dotted lines for illust-rating the independent vmovement of certain cutter sectionswith respect to others.

Figure 5 is a detail sectional view on a larger scale showing one complete cutter in sectionand illustrating `the puncturing or air vent forming means,

Figure 6 isa detail sectional view through the puncturing tool, u

Figure 7' isa detail cross sectional'view through one upper cutter taken on the line Figure 5,

Figure 8 is a detail cross section through. the'upper and lower cutter taken on the line '8 -8 of Figure 5,

1 y Figure 9 is a detail cross section Ataken on the line 9-`9 of Figure 5 and showing the `mounting for the lower cutter. y

A- Referring to the drawings in detail I have shown'the machineas including" a base 1 fromfwhich rise suitably mounted .guides 2- ron which isjslidablea carriage structure indicated generally at 3, this carriage being shown las comprising upper and lower members 4y and 5 radiating from a housing 6 and terminating in sectional sleeves 7 and 8, respectively,engaged upon the guides 2. Suitlably secured to the lower arms 5 are depending brackets 9 which support the cutting mechanism to be described. The lower sleeve members 8v may' be provided with lateralex- ,I j tensions or lugs 1() carrying rods 11 slidable through kthe base and which might, if preferred, be connect-ed l with some suitable treadle mechanism for moving the carriage. Downward movement of the carriage may be limited by stops 12 rising from the base and .upward nfiovement is of course limited by a transverse bar or other member 13 which connects the guides 2vat their upper ends. The stops12 are shown as screwed into place affidi equipped with lock nuts 14, it being thereby possible to adjust'them in case such is`necessary.

Forl -counterbalancing the slidable carlriageand Valltheparts carried thereby and tribey described,`liiiay `employ a forked lever piv'tedY as at 1.6 upon bearing brackets 17,

the ndsbf 'theleve-inarms being pivotally eenneeted asat, 18 with angularbrackets or tliellike. -19' preferably mounted beneath and seciir'e'dio the .extensions or lugs. lOof the sleeves/8L The forked lever 15 may carry insulator must be given a quarter turn and for this reason any suitable means may be provided for permitting the support formed by the parts 23, 24 and 25 to be turned to just this extent and if desired, a stop device or indicator 27 may be provided at one side.

As' above `mentioned,-'the 'entire cutting mechanism is supported from the carriage and includes two pairs of angular frame members or yokes 28 and 29pi'voted at oppo- 7:

site sides of the depending brackets 9. The members 28 are formed with extensions or lugs 30 uponr which arey pivotally and slid"- ably mounted, as by pins 31 andslots 32, intermediate links which are in turn pivotally connecte'dat 34 withthe members 29 .zu

so that all the members 28 and 29 may be moved together though to different extents. Theoperating means is here shown as confiprising a rack 35 slidablethrough the hous'- 8. ying 6 and having pivoted thereto at 36 rods f 37 `carrying clevises 38 pivotally connected at 39 with ythe links 33. rlhe Lipper' ends of the rods 37 are also'preferably equipped with clevises 4() and intermediate their ends are turnbuckles 41 for adjusting Journaled transversely of the upper portion ofthe frame and lmounted in any suitable vbearings is a shaft 42 carrying agearj43 meshing with vthe rack 35. On one end of the shaft is an operating handle 44 preferably f counterbalanced as at45.

l Secured to the frame or yoke members 28 are arms 46 which carry cutter meinbers47 which are ofgeneral arcuate shape and which are substantially elliptical in cross section I at-their ends most remote from the arms 46,

the upper portions being cut awayat opposite sides as shown at 48, the uncut portions being substantially semi-elliptical .in cross section. at 48 will be hereinafter explained. The end portions of the arms 46are formed with recesses or concavities 49 conformingly receiving the cutters 47 which are held in kplace by 1o.', The purpose of the cutting away bolts 50 or the like passing through filler blocks 51 located within the members 47 as clearly indicated in Figure 9, the arms 46 having threaded holes 52 for the reception of vthe screws or bolts. The arms 46 also carry leaf springsr53 held in place as vby screws 54 and bearing against `grub or.other adjusting screws 55 which pass through they arms 46 as clearly indicated in Figure 5, andthe purpose of which will be hereinafter explained though it should be mentioned at this point that these springs are located in such position as to be engaged by nose pieces or projections 56 on the intermediate connecting links 33.

Carried by the frame or yoke members 29 125 ably conveXed as indicated and fit conformingly withinzthecutter members58 which are substantially semi-elliptical inl cross, section. Securingis effected by means of complementary clamp elements or blocks 59 which are concavedat 60 to fit against the members 5 8. Any suitable screws or bolts 6l pass through the members 59,y the members 58 and into threaded holes 62 in they arms 57 so that the partisl will be secured.

As mentioned in the objects of they invention, an important feature is the provision of means for puncturing the slight partition wall which is certain to remain betweenthe adjacent endsA of the cutters 47v after they have completed their stroke. To. carry out this'detail, I may employ a tubular guide 63 of somewhat curved form carriedby the arm 57 and extending within the cutter member or section 58, this guide containing a flexible rod 64 projecting through a hole 65 in the arm 57 and having itsupper end projecting considerably thereabove, the lower end carrying a head 66 located. beyond the guide 63. This headl 66 is capable of limited movement longitudinally of the rod 64the extent being limited by stops 67 and 68. This head constitutes a species of valve and for this reason it is formed with a bore 69v of. slightly greater diameter than the rod 64 to provide; an air space or passage about the, latter. As this head 66 constitutes the puncturing element it has its forward end preferably beveled or cone shaped as disclosed at 70.

In the operation of the device, it will of course be understood that initially the entire carriage 3 must be inelevated position as shown in Figure 1, this being effected by moving it upwardly byI any treadle mechanism connected with. therods 11 or, if pre,- ferredby moving the lever 15. j Theinsulator 26 may then be placed in position uponits support 25. or the support 25l carryingv the insulator may be placed upon the base, the latter beingl probably preferable for the reason thattheinsulators are handled while ina.'green or plastic; condition- The carriage 3 is then causedor permitted to descend,

the downward movement `being limitedbyl engagement of the ears or lugs 104 with the stops 12. The downward movement of the carriage is sufficient to bring the cutters 47 and 58 immediately adjacent theinsulator. I/Vhen the parts are in this position it will be clear that the cutter members or sections 58 will be spacedfrom the cutters or sections 47. As shown in Figure 3 it should be observed that the cut-out' portions 48 in thecutters 47 extend sufficiently far toward the free ends thereof that the lower ends of the cutters or sections 58 will' be curved as clearly indicated,particularly'inFigure 3.

The operator then grasps thecrank handle 44androt'ates theshaft' 42 and gear 43 sorthat the rack 35 will. be moved downwardly. As this downward: movement occurs the rod members 37 will swing outwardly uponr the pivot 36, resulting in. outward swinging movement of the j intermediate links- 33" on the pivots 39 and` 34,l thel members, 29 being, ofcourse, swungI apart or downwardly upon their pivots, the, cutter sections 58 of course moving downwardly and outwardly,- atv the saine time. As'the. lower endszof these cutter sections` are. curved thepaths, of the free-ends willl be substantially circular; Owing to? lthe peculiar connection of. the lmembers 28- and 29 by means of thelinks 33it is'evident that the members 28 andI 29 will swing outwardly and downwardly to substantially thesame extent. Of courseeventhough thelinks33 are slotted at. 32` the members 28 carrying the cutter members 47 will be-moved downwardly to a. certain extent and will cut into theinr sulator along a circular path. lAs thevinner wall of the desired cut t'offorml the passageis not concentric with the outer wall the cutter members 58 and 47 must have relative move?r ment and it is for this reason that` the pin the slots 32 and thezcutter'sections 58.are still,l spacedaway from the sections 47, though the extent has` decreased gradually duringy the entire downward movement ofi thevrack bar on account of the difference in swing of the members 28 and 29.-

' To limit downward movement ofthe members 28 at this'point, I provide stopssuchas theupright', rods 71 which rise from the base and which are preferably threaded thereinto so as tomake adjustment possible. When the rodsA 37 and other parts have reached the position shownby dotted lines in Figure 4 the extensions;30 on the members 281en-gage the stops 71 so that there willbeno further downwardmovement'of the members 28. By thev time the members 28- havei reached this positionthe cutters 47 will have beenforced. through the material of theinsulator sotliat the ends thereofwill be substantially in engagement there being` only avery-'thin partition wall left uncut.

. `As the 'rack 35 continues to move downwardly the. links 33 move outwardly owing tothe provision of the slots 32therein. By

l lf) the time the inner ends of the slots engage against the pins 31 the links 33 are in such position that the nose pieces 56thereof engage upon the springs 53 whichcushion the shock while acting as stops. During this outward 1an f movement, of the links with respect tothe pins 31 the members 29 swingv stillf. further outwardly into theI position4 shown by fullv bers'58 will move in the proper lpath tov cut '.,theinner wallof the passage.

Of course it isunderstood that the tubular member 63 carrying the rod 64 andl puncturing head GG--ismount'ed within one ofthe members 58.' When the downward. movement ofthe rack bar is completed so that the assembled cutters are in substantially meeting relation, the operatorvgrasps the rod 64 and forces it downwardly so that the head Gwill be caused to puncture the slight partitionA wall 72 between the ends of the cutters. As the bore 69fin the puncturing member is of greater diameter than the ro'd 64@ it is clear that an air vent will be provided so that when the crank handle tais turned in the reverse direction to move the rack upwardly for restoring the cutting mechanism to initial position the cutters, which then of course have a reverse movement, may be withdrawn from the passages cut'thereby without producing any suction which might draw the walls inwardly and cause serious distortion as frequently occurs under ordiL 4nary methods. Naturally the clay cut out 'of the insulator remains within the cutters until forced out by some suitable tool or implement.` c

After one curvedl passage has been thus cut the carriage is eleva-ted and the-insulator is turned over or inverted with respect to its former position and is, preferably with its holder, given a quarter turn with respect to the base ll, subsequently to which the cutting operation is repeated in a manner identical 'with that above described so as to form a second passage at right angles to and interlinling with, but of course spaced from, the first formed passage. It is vof courseevident that any suitable polishing or smoothing tool may be inserted within the passages for removing the slight ragged edge which is all that remains of the partition after the same has been punctured. Subsequent tothe cutting' the insulator is of course removed from the machine and fired or. otherwise treated inthe usual manner toproduce the finished article. l

The above operation is proper to follow and will be carried out if thevmachine be of such construction as to embody only one set of cutting mechanisms mounted above a supporting stand lor table. It is readily conceiv able and will be understood by one skilled in the art that it is easily possible to dupli cate the structure below the support, there' being then two sets of cutting apparatus, one above the table and the other below, the two sets being ofcourse at right angles to each other. ,It is also easily possible to provide an operativeconnection between'the upper and lower cutting mechanisms sor that they will operate simultaneously upon opposite sides of a suitably supported 4insulator for forming both interlinking curved passages at the same time or in one operation of the machine. This possibility' is not illustrated as it 1s thought that such an arrangement would readily occur to one versed in this art after l obtaining a full comprehension of the structure disclosed.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided a. very simply constructed and easily operated machine Vby means of which the necessary interlinking curved passages may be formed in insulators of lthe Hewlett type, the arrangement being such that the cutting will be accurate and uniform throughout any number of insulators. rlhis last mentioned feature is of great I advantage inasmuch as it insures proper fitting, without bin-ding, of the suspension links employed for connecting such insulators in the usual strings. `Ample pro# vision has been made for all adjustments which may be found necessaryl to insure proper throw of the various coacting parts, these adj ust-ments taking care ofany possible variations which may occur in the general dimensions or shape of any number of insulators in a certain lot. In fact the device opcrates to accomplish all the beneficial results desired.

TWhile I have shown and described thepreferred embodiment of the invention, it should be understood that the details are merely an exemplification of the possibilities and princi ples involved as I reserve the` right to make all such changes in the construction and arrangement of parts as will increase the adaptability or widen the field of utility of the device, provided such modifications constitute no departure from the spirit of the invention or the scope of the claims hereunto appended. 1

Having -thus described the invention, I claim:

l. In a machine of the character described, the combination of a supporting structure, means for temporarily mounting an insulator thereon, oppositely arranged curved cut.- ters, and means for moving said cutters in a curved path through the material of the insulator for forming av curved passage therein.

2. In a` machine of the'character described, the combination of a supporting structure, a carriage movably mounted thereon, means for temporarily supporting an insulator beneath the carriage, cutting mechanism carried by the carriage and including curved cutting members, and means for moving the cutting members along curved paths for forming a curved passage through the mate-` rial of the insulator. p i

In a machine of the character described, the combination of a supporting structure, a carriage movably mounted thereon, means for temporarily supporting an insulator beneath the carriage, cutting mechanism carried by curved passage through the material of thev insulator, each cutting member including relatlvely movable sections.

4. In a machine of the character described,

the combination of a supporting structure, a carriage movably mounted thereon, means for temporarily supporting an insulator beneath the carriage, cutting mechanism carried by the carriage and including curved cutting members, and means for moving the cutting members along curved paths for Aforming a curved passage through the material of the insulator, each cutting member including relatively movable sections whereby the inner and outer walls of the passage will be eccentric.

5. In a machine of the character described, the combination of a supporting structure, means for temporarily mounting an insulator thereon, oppositely arranged curved cutters, means for moving said cutters in a curved path through the material of the insulator for forming a curved passage therein, and means carried by one cutter for puncturing the slight partition remaining between the ends of the cutters upon the completion of their stroke.`

6. In a machine of the character described, a support, means for temporarily mounting an insulator thereon, a pair of curved cutters, means for moving the cutters in a curved path through the material of the insulator whereby the ends of thercutters will substantially contact, a guide rwithin one cutter, and a puncturing means slidable through the guide r.for puncturing the material re` maining between the ends of the cutters at the completion of their stroke.

7. In a machine of the character described, a support, means for temporarily mounting ,an insulator thereon, a pair of curved cutters,

means for moving the cutters in a curved path through the material of the' insulator whereby the ends of the cut-ters willsubstantially contact, a guide Within one cutter, a puncturing means slidable through the guide for puncturing the material remaining between the ends of the cutters at the complle tion of their stroke, the puncturing means including a rod slidable through the guide, and a head loosely mounted upon the rod for forming an air vent.

8. Means for forming a curved passage through an insulator, comprising a pair of cutters movable in opposite directions in a curved path whereby to substantially meet within the insulator in end to end relation, and a vent forming member movably mounted within one cutter and projectable through the material remaining between'the adjacent ends or the cutters.

9. Means for forminga curved passage in an insulator, comprising .a pair of curved cut-` ters movable in a 'curved path in` opposite directions to substantially meet within the body of the insulator, and combined penetrating and vent i'orming means mounted within and carried by one cutter. f l0. Means for forming a curvedk passage in an insulator, comprising a pair of curved cutters movable in a curved path in opposite directions to substantially meet within the body of the insulator, combined penetrating and vent forming means mounted within and carried by one cutter, each cutter including relativelyfmovable sections, and means for moving the sections independently wherebyI the outer and inner walls of the passage will be eccentric. y ll. In a machine for cutting curved passages in insulators, the combination of a rela? tively stationary supporting structure vfor holding `an insulator, a carriage vertically movably mounted with respect to the supporting structure, means for moving the carriage, 'curved coacting cutters movably mounted on the carriage, meansfor moving the cutters.

v12. In a machine forcutting curved passages in insulators, the combination of a relatively stationary supporting structure for holding an insulator, a carriage. ,vertically movably mounted with respect to the sup-` porting structure, means for moving the carriage, curved coacting cutters movably mountedlon the carriage, means for moving the cutters,'the cutters being formed of relatively movable sections, and means for mov` ing the sections simultaneously and v relatively.

13. In a machine of the character clescribed, the combination ot asupporting structure, members pivotally mounted thereon, cutters carried by said members, 'and means for swinging said members for mov# ing the cutters in an arcuate path. 14. In a machine Jfor cutting curved passages in insulators, a stationary supporting structure, members pivotally mounted thereon, cutters mounted on said members, and means for swinging said members tomove thecutters in an arcuate path .intox substan. tialiy end to end relation. y l5. In a machine for cutting curved passages in insulators, a stationary supporting y structure, members pivotally mounted there-` on, cutters mounted on said members, means for swinging said members to move the 'cut'-` ters in an arcuate path into substantially end to end relation, and vent means carried by j thereon, a plurality of pairs of members piv-l oted on the supporting structure, cutter elements carried by said pairs of members, and means for moving said members simultaneouslyand .relatively for forcing the cutter elements through the material of the insulator.

kl17, In a machine of the character described, the combination of a stationary supporting structure, a carriage movably mountloiledfthereon, means for moving the carriage,

memberspivoted on the carriage, lever operated` means for-moving said members, and

cuttin elements carried by the members.

1:8. n a machine of the character delascribed, a stationary support, a carriage ver-y tically movable thereon,v means for moving the carriage, members pivoted on the carriage, means connecting said members for substantially Simultaneous movement, means for movingsaid members, and coacting cutter,V elements carried by saidy members.

19,In v a lmachine of the character described, a supporting structure, pairs yof members pivotally mounted thereon and 25,.;carrying cutter elements, ymeans for moving said members, and means connecting said members and permitting relative movement between the pairsthereof.

20. In-a machine of the character deaogscribed, a supporting structure, pairs of members pivoted thereon, curved cut-ter elements. carried by the respective members, means for movingsa-id. members substantially simultaneously, and means connecting the .members of t-he pairsfor permitting limited relative movement thereof..

.21.In a machine of the character described, ay supporting structure, pairs of,

members `pivoted thereon, curved cutter ele- 4o,v,mentsrcarried by` the respective members,

'means for moving said members substantially simultaneously, and means connecting the members of the pairs for permitting limited relative movement thereof for bringing the cutter elements carried thereby into in- 'terfitting relation.

In a machine of the character described, a supporting structure, stop elements carried thereby, .outer and inner mem- I Vbers pivoted on the supporting structure, the

'5,5, and-,cutter .elements carried by the respective members and movable in an arcuate path.

23. In a machine of the character ldescribed, a support, stop elements, outer and inner members pivoted for movement in a @0e-vertical plane, the outer members being engageable with said stops, means connecting thelouter and inner members for moving the same together and permitting limited relative movement of the inner members with respect to the outer, and cushioning means cartmw ried by the outer members and coacting with said connecting means.

24. In a machine of the character described, a support, stop elements, outer and inner members pivoted for move-ment in a vertical plane, the outer members being engageable with saidstops, means connecting the outer and inner members for moving the same together and permitting limited relative movement of the inner members with respect to the outer, cushioning mea-ns carried by the outer members and coacting with said connecting means, and means for adjusting said cushioning means.

25. `Inl a machine of the character described, a stationary support, a carriage, means for moving the carriage, members pivoted on t-he carriage and carrying cutters adapted to be moved in an arcuate path, connecting elements connecting said members in pairs and permitting limited relative movement, divergent arm members pivotally connected with said connecting members, and means connected with said arm members for moving the same.

26. In a machine of the character described; a stationary support, y la carriage, means for moving the carriage, members pivoted on the carriage and carrying cutters adapted to be moved in an arcuate path, connecting elements connecting said members in pairs and permittingY limited relative movement, divergent arm members pivotally connected-withsaid connecting members, means connected with said arm members for movingrthe same, comprising a vertically movable rack bar pivotally connected with said l l arm, and gearmeans for moving the rackbar.

27. In a machine Aof the character described, a supporting structure, meansv for mounting an insulator temporarily thereon, a

carriageslidably mounted o n the supporting structure, means for counterbalaiicing the carriage, cutters movably carried by the carf riage, and means for niovingthe cutters in a curved path through the insulator to form a curved passage therethrough.

28. In a machine of the character -described, a supporting structure, means for temporarilymounting an insulator thereon, a

carriage slidable on the supporting structure, 1

a rack bar, gear means for moving the rack bar, yoke members pivoted on the carriage, operative connections between the yoke memneamea tor thereon, an operating .member `slidably mounted with respect tothe supportingstructure, yoke members ,pi-voted with respect to the `supporting ystructure and carrying ytubu-v lar curved cutters, .linkconnections between .said operating member and said yoke lmembers, means for moving said operatingmember longitudinally to swing said `yokes for .forcing the cutters through the material of theinsulator ina curved path, and means for adjusting l.the length ofsaid links -for varyingor adjusting the throw of the yoke members.

.31. In a machine of the ycharacter described, a stationary supporting structure, means for temporarily supporting an insulator thereon, an operating member slidably mounted with respect to the supporting structure, yoke members pivoted with respect to the supporting structure and carrying tubular curved cutters, link connections between said operating member and said yoke members, means for moving said operating member longitudinally to swing said yokes for forcing the cutters through the material of the insulator in a curved path, and stops forming part of the stationary structure and engageable by certain of the yoke members for limiting outward swinging movement thereof.

32. In a machine of the character described, a relatively stationary supporting structure, a plurality of pairs of yoke members pivoted with respect thereto, the respective pairs of yoke members carrying coacting cutter sections, means for swinging said yoke members simultaneously, and means operatively connecting the pairs of yoke members for moving them relatively during their simultaneous movement whereby the cutter sections will be moved relatively.

33. In a machine of the character described, a relatively statio-nary sup-porting structure, means fortemporarily mounting an insulator thereon, pairs of yoke members p-ivotally mounted with respect to the supporting structure, coacting cutter sections carried by the respective pairs of yoke members, links pivotally connecting the respective yoke members for permitting relative movement thereof, and means connected with said links for effecting swinging movement of the yoke members simultaneously.

'34. In :a `machine fof the character described, a relatively 'stationary supporting structure, means lfor temporarily ymounting' an insulator thereon, ipairs of yokemembers pivotally mounted .With respect to the supporting structure, Lcoacting cutter sections carried .by the respectivepairs of yoke mem` bers, links pi'votally connectingthe respective yoke members for permitting relative movement thereof, and means connected with said links .for effect-ing swinging movement lof the yoke members simultaneously, said links having portions engageab-le with :the yoke members of one pair. i

35. In a machine Aof the ycharacter 'described, a relatively stationary .supporting structure, means for temporarily mounting an .insulator thereon, pairs of yoke members pivotally mounted :with respect to the sup-- porting vstruc-ture, coacting' cutter sections carriedby ,the respective pairsiof yoke members links `)ivoted u on one air of oke a l V `members-and -pivotally and slidab-ly connected `with the yoke membersl ofthe other pair,

said link members having extensions thereon, and yieldable abutments on said second. named pair of yoke members-engageable b-y said extensions?.

36. In a machine of the character de-4 scribed, a relatively stationary supporting structure, means for temporarily mounting an insulator thereon, a carriage slidably mounted upon said supporting structure, a plurality of yoke members p-ivoted on said carriage and carrying curved cutters, a rack bar slidably mounted within the carriage, operative connect-ions between the rack bar and said yoke members, and an operating shaft carrying a gear meshing with said rackbar.

37. In a machine of the character described, means for temporarily mounting an insulator thereon in plastic condition, curved cutters, and means for forcing the cutters in opposite directions through the insulator.

38. In a machine of the character described, means for temporarily supporting an insulator in plastic condition, curved cutters, and means for simultaneously moving the cutters in opposite directions through the material of the insulator into end to end relation.

39. In a machine of the character de- I tracting the cutter at different stages of its movement.

; 41'. In a machine ofi the character de-4 scribed, means tor temporarily supporting into end to end relation through the materialof the insulator, and means for expanding portions of tliecutters for flaring the ends of t-lie Vcurved passage formed thereby. f

43. In a machine of the character de'- scribed, means' for temporarily supporting an insulatorinplastic condition, curved` cutters, means for forcing the curved cutters through the materialof the-insulator into end to end relation, andiiieans carried byone cuttermovableJ into the other iorpuncturing the division Wall -remainin'g'- between the ends of the cutters.

44. Ina machine of the character cle--A scribed, means for temporarily supporting an insulator in plastic condition, curved cutters,nicans for moving the cutters in a curved path ftlirougli'tlie material of the insulator into end to end relation, mea-ns for moving the cutters in the opposite direction to with* draw them from the insulator, and means for preventing the development of suction Within the passages formed bythe cutters when the cutters are Withdrawntherefrom.

45. In a machine oi thecharacter described, means for temporarily.supporting an insulator in plastic condition, curved'cutters, means for initially expanding` the cutters, means for moving the expanded cutters into the material ofthe insulator, and means for simultaneously moving thel cutters Ain a curved path and contracting the saine.

A46. In a machine of the' character de-y scribed, means for supporting an insulator in plastic condition, a curved cutter, means for forcing the cutter in a curvedpath through `the material ot the insulator, and means for expanding and contracting the cutter at different tiniest In testimony whereof I vailix my signature.

-sTEWAiiT L. Mooaii, JR. 

